// Emacs style mode select   -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// DESCRIPTION:
//      Play functions, animation, global header.
//
//-----------------------------------------------------------------------------

#ifndef __P_LOCAL__
#define __P_LOCAL__

#ifndef __R_LOCAL__
#include "r_local.h"
#endif

#define FLOATSPEED              (FRACUNIT*4)

#define MAXHEALTH               100
#define VIEWHEIGHT              (41*FRACUNIT)

// mapblocks are used to check movement
// against lines and things
#define MAPBLOCKUNITS   128
#define MAPBLOCKSIZE    (MAPBLOCKUNITS*FRACUNIT)
#define MAPBLOCKSHIFT   (FRACBITS+7)
#define MAPBMASK                (MAPBLOCKSIZE-1)
#define MAPBTOFRAC              (MAPBLOCKSHIFT-FRACBITS)

// player radius for movement checking
#define PLAYERRADIUS    16*FRACUNIT

// MAXRADIUS is for precalculated sector block boxes
// the spider demon is larger,
// but we do not have any moving sectors nearby
#define MAXRADIUS               32*FRACUNIT

#define GRAVITY         FRACUNIT
#define MAXMOVE         (30*FRACUNIT)

#define USERANGE                (64*FRACUNIT)
#define MELEERANGE              (64*FRACUNIT)
#define MISSILERANGE    (32*64*FRACUNIT)

// follow a player exlusively for 3 seconds
#define BASETHRESHOLD           100

//
// P_TICK
//

// both the head and tail of the thinker list
extern  thinker_t       thinkercap;

void P_InitThinkers (void);
void P_AddThinker (thinker_t* thinker);
void P_RemoveThinker (thinker_t* thinker);

//
// P_PSPR
//
void P_SetupPsprites (player_t* curplayer);
void P_MovePsprites (player_t* curplayer);
void P_DropWeapon (player_t* player);

//
// P_USER
//
void    P_PlayerThink (player_t* player);

//
// P_MOBJ
//
#define ONFLOORZ                MININT
#define ONCEILINGZ              MAXINT

// Time interval for item respawning.
#define ITEMQUESIZE             128

extern mapthing_t       itemrespawnque[ITEMQUESIZE];
extern int              itemrespawntime[ITEMQUESIZE];
extern int              iquehead;
extern int              iquetail;

void P_RespawnSpecials (void);

mobj_t*
P_SpawnMobj
( fixed_t       x,
  fixed_t       y,
  fixed_t       z,
  mobjtype_t    type );

void    P_RemoveMobj (mobj_t* th);
boolean P_SetMobjState (mobj_t* mobj, statenum_t state);
void    P_MobjThinker (mobj_t* mobj);

void    P_SpawnPuff (fixed_t x, fixed_t y, fixed_t z);
void    P_SpawnBlood (fixed_t x, fixed_t y, fixed_t z, int damage);
mobj_t* P_SpawnMissile (mobj_t* source, mobj_t* dest, mobjtype_t type);
void    P_SpawnPlayerMissile (mobj_t* source, mobjtype_t type);

//
// P_ENEMY
//
void P_NoiseAlert (mobj_t* target, mobj_t* emmiter);

//
// P_MAPUTL
//
typedef struct
{
    fixed_t     x;
    fixed_t     y;
    fixed_t     dx;
    fixed_t     dy;

} divline_t;

typedef struct
{
    fixed_t     frac;           // along trace line
    boolean     isaline;
    union {
        mobj_t* thing;
        line_t* line;
    }                   d;
} intercept_t;

#define MAXINTERCEPTS   128

extern intercept_t      intercepts[MAXINTERCEPTS];
extern intercept_t*     intercept_p;

typedef boolean (*traverser_t) (intercept_t *in);

fixed_t P_AproxDistance (fixed_t dx, fixed_t dy);
int     P_PointOnLineSide (fixed_t x, fixed_t y, line_t* line);
int     P_PointOnDivlineSide (fixed_t x, fixed_t y, divline_t* line);
void    P_MakeDivline (line_t* li, divline_t* dl);
fixed_t P_InterceptVector (divline_t* v2, divline_t* v1);
int     P_BoxOnLineSide (fixed_t* tmbox, line_t* ld);

extern fixed_t          opentop;
extern fixed_t          openbottom;
extern fixed_t          openrange;
extern fixed_t          lowfloor;

void    P_LineOpening (line_t* linedef);

boolean P_BlockLinesIterator (int x, int y, boolean(*func)(line_t*) );
boolean P_BlockThingsIterator (int x, int y, boolean(*func)(mobj_t*) );

#define PT_ADDLINES             1
#define PT_ADDTHINGS    2
#define PT_EARLYOUT             4

extern divline_t        trace;

boolean
P_PathTraverse
( fixed_t       x1,
  fixed_t       y1,
  fixed_t       x2,
  fixed_t       y2,
  int           flags,
  boolean       (*trav) (intercept_t *));

void P_UnsetThingPosition (mobj_t* thing);
void P_SetThingPosition (mobj_t* thing);

//
// P_MAP
//

// If "floatok" true, move would be ok
// if within "tmfloorz - tmceilingz".
extern boolean          floatok;
extern fixed_t          tmfloorz;
extern fixed_t          tmceilingz;

extern  line_t*         ceilingline;

boolean P_CheckPosition (mobj_t *thing, fixed_t x, fixed_t y);
boolean P_TryMove (mobj_t* thing, fixed_t x, fixed_t y);
boolean P_TeleportMove (mobj_t* thing, fixed_t x, fixed_t y);
void    P_SlideMove (mobj_t* mo);
boolean P_CheckSight (mobj_t* t1, mobj_t* t2);
void    P_UseLines (player_t* player);

boolean P_ChangeSector (sector_t* sector, boolean crunch);

extern mobj_t*  linetarget;     // who got hit (or NULL)

fixed_t
P_AimLineAttack
( mobj_t*       t1,
  angle_t       angle,
  fixed_t       distance );

void
P_LineAttack
( mobj_t*       t1,
  angle_t       angle,
  fixed_t       distance,
  fixed_t       slope,
  int           damage );

void
P_RadiusAttack
( mobj_t*       spot,
  mobj_t*       source,
  int           damage );

//
// P_SETUP
//
extern byte*            rejectmatrix;   // for fast sight rejection
extern short*           blockmaplump;   // offsets in blockmap are from here
extern short*           blockmap;
extern int              bmapwidth;
extern int              bmapheight;     // in mapblocks
extern fixed_t          bmaporgx;
extern fixed_t          bmaporgy;       // origin of block map
extern mobj_t**         blocklinks;     // for thing chains

//
// P_INTER
//
extern int              maxammo[NUMAMMO];
extern int              clipammo[NUMAMMO];

void
P_TouchSpecialThing
( mobj_t*       special,
  mobj_t*       toucher );

void
P_DamageMobj
( mobj_t*       target,
  mobj_t*       inflictor,
  mobj_t*       source,
  int           damage );

//
// P_SPEC
//
#include "p_spec.h"

#endif  // __P_LOCAL__
